<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>合并单元格</title>
</head>

<body>
    <div>
        <table border="1px">
            <thead>
                <tr>
                    <td colspan="3" align="center">信息</td>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td rowspan="2">21</td>
                    <td>22</td>
                    <td>23</td>
                </tr>
                <tr>
                    <td>31</td>
                    <td>32</td>
                </tr>
            </tbody>
        </table>
    </div>
</body>

</html>